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Depends on the grain. Millet and birdseed jars will keep even for 4-5 months, while colonized rye deteriorates fast and is often very disintegrated(digested) only 2 months after colonization.Better though to use the grain immediately after it is completely colonized or to store it in the fridge.

I'm using WBS, but are you sure about 4-5 months? I've kept some jars for almost 2 months are fully colonized, and the mycelia looks as if it's dried out. I guess my question now is, how do you tell if the jar starts to die out?